cat-relè

RelayBR

1Index

Buchholz relay

General information 2

Overall dimensions according to EN 50216-2 and EN 50216-2_A1 6Gas sampling device 22

Requirement sheet 23

Gas relay


Overall dimensions 26


Flow relay


Overall dimensions 32


2BR

Transformer outages have a considerable economic impact on the operation of a power supply network. Therefore it is the aim to ensure an accurate assessment of the transformer condition.

Partial discharges, leakage currents, hot spots and arcing are phenomena that contribute to degradation of oil insulating performances by generating dangerous gas flow inside the transformer tank.

Buchholz relay

Internal gas accumulation and oil flow are monitored and kept under control by the Buchholz relay.

Thanks to COMEMs proven expertise, we have developed a reliable Buchholz relay that promptly provide information about internal malfunctioning giving the possibility to eventually stop the system prior its destruction.

The Buchholz relay is sited in the pipework between the transformer and its conservator and it is filled with oil during normal transformer operation.

When gas is generated in the transformer it rises towards the conservator and collects in the upper chamber of the relay.The oil level drops and the top float triggers alarm switch.Gas shall not freely pass from the relay body and escape into the pipework before the alarm contact has operated.

Another important functionality of the Buchholz relay is to operate if oil flow from the transformer tank to the oil conservator. In case the oil flow speed exceed the pre-set value, the the flow vent operates and switch the trip contact.

3Advantages Provenonthefieldreliability Nofalsealarms Robustreedswitchdesign Electricalwiringprovidedwithchange-overcontacts Additionalaccessories:Gassamplingdevice.

4Buchholz relay

ConstructionThe housing consists of an aluminum alloy and it is provided with flanges for the connection of the transformer tank pipe and the oil conservator pipe. The terminals of the reed switches are positioned in the terminal box and the perfect sealing is guaranteed by an OR gasket.The terminal box cover (1) is fixed to the terminal box with 4 unloosable screws. There are two floats (8) with their associated switches encapsulated in glass bulbs.The flow vent (9) has two permanent magnets.

(9)

(8)

(1)

Special featuresUpon request our Buchholz relais are available with 4M6 vibration class in accordance with EN 50216-2 and EN 50216-2_A1, load stress are in compliance to EN60721-3-4 and to C5. Buchholz relais are available with improved corrosion resistance C5 class according to ISO 12944, suitable for off-shore environment and high salinity area.

5Installation guidelinesThefollowingtablegivesguidelinesvalues:

Transformer PowerMVA

Pipe Nominal diameter

Volume of oilTons

Up to 5MVA 25 Up to 3,5

From 5 up to 20 MVA 50 From 3,6 up to 14

Over 20 MVA* 80 Over 14,1*

Over 20 MVA* 100 Over 14,1*

* In agreement with the transformer design

Tests

Topic Test description Standard

Type tests

Checking of the switching capacity of contacts EN 50216-1Vacuum test EN 50216-2 and EN 50216-2_A1Impulse withstand test of electrical circuits EN 50216-1Calibratione of gas collection scale on relay window to operate alarm contact if required EN 50216-2 and EN 50216-2_A1Determination of the minimum oil flow to operate the contact and the time for closing EN 50216-2 and EN 50216-2_A1Verification of the absence of reaction of contacts to a flow of oil from conservator to the tank EN 50216-2 and EN 50216-2_A1Pressurewithstandtest EN 50216-2 and EN 50216-2_A1Verification of the absence of reaction of contacts to magnetic field EN 50216-2 and EN 50216-2_A1Vibration test EN 50216-1

Routine testsShort duration power frequency withstand test EN 50216-1Oil leakage test EN 50216-2 and EN 50216-2_A1Operation test EN 50216-2 and EN 50216-2_A1

6Buchholz relay

Overall dimensions according to EN 50216-2 and EN 50216-2_A1BG25

Weight 2.1 Kg

G1"

1/2A

7BR25

Weight 2.9 Kg

8Buchholz relay

Overall dimensions according to EN 50216-2 and EN 50216-2_A1BR50

Weight 4.9 Kg

9BR80

Weight 5.8 Kg

10

Overall dimensions according to EN 50216-2 and EN 50216-2_A1BS25

Weight 2.2 Kg

Buchholz relay

11

BS50

Weight 4.1 Kg

12

Overall dimensions according to EN 50216-2 and EN 50216-2_A1BS80

Weight 4.3 Kg

Buchholz relay

13

NF25

Weight 3.0 Kg

14

Overall dimensions according to EN 50216-2 and EN 50216-2_A1NF50

Weight 4.8 Kg

Buchholz relay

15

NF80

Weight 5.5 Kg

16

Overall dimensions according to EN 50216-2 and EN 50216-2_A1C01

Weight 2.2 Kg

Buchholz relay

17

C1

Weight 2.3 Kg

18

Overall dimensions according to EN 50216-2 and EN 50216-2_A1C4

Weight 5.9 Kg

Buchholz relay

19

Main features

General dataMaterial All the external part are resistant to transformer oils, salt fog and UV rays

Ambient temperature -40 to 80C

Oil temperature -40 to 115 C

Degree of protection IP65inaccordancewithEN60529

Oil flow speed (oil temperature 20C) 1.00 0.15 m/s

1.50 0.20 m/s

2.00 0.30 m/s

Switch electrical data (according to EN 50216-2 and EN 50216-2_A1)Breaking capacity Voltage Current Breaking capacity

220 V d.c. (min. 12V) 2 A for 1000 maneuvers 250 W L/R0.5

Dielectric strength of contacts Short duration power frequency withstand voltage 1 min kV (r.m.s.)

Lightning impulse withstand voltage kV (peak)

Between circuits and earth 2 5

Across open contacts 1 3

Gas volume to trip alarmBuchholz relay type

BG25-BR25-NF25-C01-C1 100-200 cm3

NF50-NF80 100-200 cm3

BR50-BR80-C4 150-250 cm3

BS25 170-230 cm3

BS50-BS80 250-300 cm3

20

Buchholz relay

Wiring diagramsDiagram type A - ALARM CONTACT (terminals 3-4) NO contact

-TRIPCONTACT(terminals1-2) NO contact

Diagram type L - ALARM CONTACT (terminals 3-4- C2) change over contact NOcontact:terminals4-C2;NCcontact:terminal3-4

-TRIPCONTACT(terminals1-2-C1)changeovercontact NOcontact:terminals2-C1;NCcontact:terminal1-2

Diagram type P - ALARM CONTACT (terminals C2-3) NO contact- ALARM CONTACT (terminals C1-4) NO contact


1 2

Trip circuit

3 4

Alarm circuit

1 2

Trip circuit

Alarm circuit

C1 3 4 C2

1 2

Trip circuit

C1 3

Alarm circuit

C1 4

21

Diagram type G - ALARM CONTACT (terminals 3-4) NO contact-TRIPCONTACT(terminalsC2-2) NO contact

-TRIPCONTACT(terminalsC1-1) NO contact

Diagram type I - ALARM CONTACT (terminals 5-6) NO contact- ALARM CONTACT (terminals 7-8) NO contact

-TRIPCONTACT(terminals1-2) NO contact-TRIPCONTACT(terminals3-4) NO contact

Diagram type V - ALARM CONTACT (terminals 5-6) NC contact- ALARM CONTACT (terminals 7-8) NC contact

-TRIPCONTACT(terminals1-2) NC contact-TRIPCONTACT(terminals3-4) NC contact

C1 1 3 4

Alarm circuit

C2 2

Trip circuit

3 41 2

Trip circuit

5 6

Alarm circuit

7 8

3 41 2

Trip circuit

5 6

Alarm circuit

7 8

22

Gas sampling device Insulating materials within transformers and electrical equipment break down to liberate gases. The distribution of these gases can be related to the type of electrical fault, and the rate of gas generation can indicate the severity of the fault. The identity of the gases being generated by a particular unit can be very useful information in any preventative maintenance program.

The collection and analysis of gases in an oil-insulated transformer can indicate the severity of the default.

The presence of gas inside an oil filled transformer is always a sign of malfunction and one of the tasks of the Buchholz relay is to signal this presence. Analysis of the evolved gas can often give good indication of the type of malfunction but accessing the Buchholz relay during live operation of the transformer can be hazardous. The gas sampling device has been designed to overcome this problem by siting the unit remote from the Buchholz and in a readily accessible position typically on the side of the transformer.

ConstructionThe COMEM gas sampling device is manufactured from an aluminiumalloycastingwiththefollowingfittings:- a tempered glass inspection window with graded markings for

volume indication.- a gas sampling valve (2).- a bleed valve (3).- a gas inlet valve for pneumatic testing (5).- a valve for draining oil from the relay (this can be mounted on

the right or left hand side of the body (6) or (7). As a routine test all castings are tested by injecting ambient air at2.5barfor2minutes.Acertificatetothiseffectissuppliedwiththeunit.Forthesakeofstandardisationthedeviceisfittedwith the left and right hand valve supports but only one valve.

Customer can then choose which side he prefers.-withfittingsforoutsidedia.10tubes,code1RDPG00005(standard);

-withfittingsforoutsidedia.6tubes,code1RDPG00006(onrequest);

-withfittingsforoutsidedia.8tubes,code1RDPG00007(on request).

Buchholz relay

23

Requirement sheet

Number of pieces

Size and model

BG25

BR25

BR50

BR80

BR80 8 holes

BS25

BS50

BS80

NF25

NF50

NF80

C01

C1

C4

Electric contact layoutA

L

P

G

I

V

Sealing NBR -40 VITON

Forusein:

Moderate salinity areas acc. to ISO 12944

Off-shore areas acc. to ISO 12944

Optionavailableuponrequest:

Gas sampling device Tube 6 mm Tube 8 mm Tube 10 mm

24

R1

Distribution transformers have the same working principle of Power transformers therefore they are influenced by the same fault principles. However, their specific design requires a different approach when talking about safety devices: COMEM Gas relay is the right solution for detecting the internal gas generated by various phenomena like dielectric failure, slight overload and degradation of insulating oil.

Gas accumulation is monitored and kept under control by the gas relay.Ensure air bag functionality within the oil conservator.

Additionally, all kind of transformers may be equipped with oil conservator air bag (air cushion embedded into the oil conservator) and it is fundamental to ensure its correct functioning:thankstoCOMEMGasrelayflexibility,itcanbeusedforpromptlydetectingunexpecteddeflationorpunchingby stopping the transformer.

Gas relay

25

Working principleFor Distribution transformers, the gas relay is mounted onthe transformer tank.When gas is generated in the transformer it rises towards theconservator and collects in the upper chamber of the relay.The oil level drops and the top float triggers alarm switch.

Gas shall not freely pass from the relay body and escape intothe pipework before the alarm contact has operated.Alternatively, it is mounted on top of oil conservators andonce there is a sudden air flow from air bag it trips thetransformer.

26

Gas relay

Overall dimensions R1

Weight 1.9 Kg

27

RF1

Weight 2.2 Kg

28

Gas relay

Main features






1.50 0.20 m/s

2.00 0.30 m/s


220 V d.c. (min. 12V) 2 A for 1000 maneuvers 250 W L/R0.5




Across open contacts 1 3Operating pressure - 1 bar, tested to 2,5 bar for 2 minutes at 100 deg C.

Gas volume to trip alarmBuchholz relay type

R1 - RF1 75 cm3

Wiring diagrams

Diagram type A - ALARM CONTACT (terminals 3-4) NO contact


Diagram type L - ALARM CONTACT (terminals 3-4- C2) change over contact NOcontact:terminals4-C2;NCcontact:terminal3-4

-TRIPCONTACT(terminals1-2-C1)changeovercontact NOcontact:terminals2-C1;NCcontact:terminal1-2

1 2

Trip circuit

3 4

Alarm circuit

1 2

Trip circuit

Alarm circuit

C1 3 4 C2

29

Requirement sheet

Number of pieces

Size and modelR1

RF1

Electric contact layoutA

L

Sealing NBR-40C VITON

Forusein:



30

OR-25 relay

The flow Relay is used as a protective device sensitive to the effects of dielectric failure inside the energized (on load) tap-changer.

The flow relay detects a failing transformer. If an arc forms, gas accumulation is rapid, and oil flows rapidly into the conservator. This flow of oil operates a switch attached to a vane located in the path of the moving oil. This switch normally will operate a circuit breaker to isolate the apparatus before the fault causes additional damage.

Promptly detect leakages from Energized Tap Changers oil compartment to the oil conservator.

The relay for OLTC application is positioned in the pipe work between the on-load tap-changer head and the oil conservator. This relay responds only if oil flow occurs from the on-load tap-changer head to the oil conservator. If this happens, the flow vane switches the reed . The circuit breakers are tripped and the transformer is de-energized.

Flow relay

31

Advantages- Complete protection for both the energized tap-changer and

the transformer- Detection of any eventual malfunctioning or failure in the

diverter switch or sector oil compartment- Transformer trip

32

Flow relay

Overall dimensions OR25

Weight 2.9 Kg

33

Main features






1.00 0.15 m/s

1.50 0.20 m/s

2.00 0.30 m/s


24 V DC to 220 V DC 2 A for 1000 maneuvers 250 W L/R0.5




Across open contacts 1 3

Tests

Type test: Relevant Standard

Routine test Relevant Standard

Vibration test EN 60137-3-4EN 60068-3-3

Oil leakage test in hot oil (90Cfor30minutesat100kPa)

EN 50216-2 and EN 50216-2_A1

Vacuumtest(2.5kPafor24hours) EN 50216-2 and EN 50216-2_A1 Operation test Leakage test (250kPafor2minutesat100C)

EN 50216-2 and EN 50216-2_A1 Mechanical test EN 50216-2 and EN 50216-2_A1

Salt fog test (500 hours) UNI EN ISO 9227 Flow vane test EN 50216-2 and EN 50216-2_A1DegreeofprotectionIP65 EN 60529 Dielectric test EN 50216-2 and EN 50216-2_A1

34

Flow relay

Wiring diagramsDiagram type AO -TRIPCONTACT(terminals1-2) NO contact

Diagram type LO -TRIPCONTACT(terminals1-2-3)changeovercontact NOcontact:terminals2-3;NCcontact:terminal1-2

Diagram type GO -TRIPCONTACT(terminals1-2) NO contact


TIPOType

CODICEp/n

00 5COR468900

01 5COR468901

02 5COR468902

03 5COR468903

04 5COR468904

05 5COR468905

06 5COR468906

A

B

C

D

E

F

A

B

C

D

E

F

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8

R-4689-015COR468900NUOVO RELE' OLTCSCHEMI ELETTRICI

Dis. Drwg.Codice - Part NumberDescrizione Description

201EMESSOContr.:Chkd.:Ramponi E.Disegn.:Operat.:E-4689

Sost.:Replaced:

Riferimenti:References:11/09/2012

Data:Date:

Propriet della COMEM. Senza autorizzazione scritta dalla stessa il presente disegno non potr essere utilizzato per la costruzionedell'oggetto rappresentato n venire comunicato a terzi o riprodotto. La societ proprietaria tutela i propri diritti a norma di legge.All property rights of COMEM. This drawing must not be reproduced in any medium nor utilized for the manufacture of the articleherein rapresented or disclosed to other parties without our licence. Any infringement will be legally persecuted.

NOScala:Scale:

Peso NettoNet. Wt.

Peso GrezzoGross. Wt.

ValoriAngolari

30'AngularValues

4321.20.80.50.30.2

Tolle

ranz

e Ge

nera

liGe

nera

l Tole

ranc

es

Dimensioni in mmDimensions in mm

21.20.80.50.30.20.1

kg0.50.30.20.150.10.05

>200010004001203063 200010004001203063

35

Diagram type VO -TRIPCONTACT(terminals1-2) NC contact-TRIPCONTACT(terminals3-4) NC contact

Diagram type RO -TRIPCONTACT(terminals1-2) NC contact


Diagram type CO -TRIPCONTACT(terminals1-2-C1)changeovercontact NOcontact:terminals2-C1;NCcontact:terminal1-C1

-TRIPCONTACT(terminals3-4-C2)changeovercontact NOcontact:terminals4-C2;NCcontact:terminal3-C2

TIPOType

CODICEp/n

00 5COR468900

01 5COR468901

02 5COR468902

03 5COR468903

04 5COR468904

05 5COR468905

06 5COR468906

A

B

C

D

E

F

A

B

C

D

E

F

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8




Sost.:Replaced:


Data:Date:


NOScala:Scale:

Peso NettoNet. Wt.


ValoriAngolari

30'AngularValues

4321.20.80.50.30.2

Tolle

ranz

e Ge

nera

liGe

nera

l Tole

ranc

es


21.20.80.50.30.20.1

kg0.50.30.20.150.10.05

>200010004001203063 200010004001203063

36

Wiring diagrams

Flow relay

Diagram type TO -TRIPCONTACT(terminals1-2-C1)changeovercontact NOcontact:terminals2-C1;NCcontact:terminal1-C1

- TRIPCONTACT(terminals3-4) NO contact

TIPOType

CODICEp/n

00 5COR468900

01 5COR468901

02 5COR468902

03 5COR468903

04 5COR468904

05 5COR468905

06 5COR468906

A

B

C

D

E

F

A

B

C

D

E

F

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8




Sost.:Replaced:


Data:Date:


NOScala:Scale:

Peso NettoNet. Wt.


ValoriAngolari

30'AngularValues

4321.20.80.50.30.2

Tolle

ranz

e Ge

nera

liGe

nera

l Tole

ranc

es


21.20.80.50.30.20.1

kg0.50.30.20.150.10.05

>200010004001203063

37

Requirement sheet

Number of pieces

Size and modelOR25

Electric contact layoutAO

LO

GO

VO

RO

CO

LO

Sealing NBR

Forusein:



Strada Regionale 11, Signolo 2236054 Montebello Vicentino (VI) - ITALYTel. +39 0444 449311Fax +39 0444 449352 - 440359E-mail:[email protected]

www.comem.com

Due to technical product updates, the information contained in this catalogue may be subject to change without notice.

Copyright 2013 COMEM.All rights reserved.

Ed. 03/2015

cat-relè

Documents

Transcript of cat-relè